;Exercise 1.10
;The following procedure computes a mathematical function called Ackermann’s
;function.

(define (A x y)
  (cond ((= y 0) 0)
        ((= x 0) (* 2 y))
        ((= y 1) 2)
        (else (A (- x 1)
                 (A x (- y 1))))))

;What are the values of the following expressions?
(A 1 10)
;1024
(A 2 4)
;65536
(A 3 3)
;65536

;Consider the following procedures, where A is the procedure defined above:
(define (f n) (A 0 n))
(define (g n) (A 1 n))
(define (h n) (A 2 n))
(define (k n) (* 5 n n))
;Give concise mathematical definitions for the functions computed by the proce-
;dures f, g, and h for positive integer values of n. For example, (k n) computes
;5n^2.
(f n) computes 2y
(g n) computes n^2
(h n) computes 2^(2^n)
